CN102810724A - High-frequency antenna, magnetic resonace apparatus equipped with the antenna, and manufacturing method for the antenna - Google Patents
High-frequency antenna, magnetic resonace apparatus equipped with the antenna, and manufacturing method for the antenna Download PDFInfo
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- CN102810724A CN102810724A CN2012101741562A CN201210174156A CN102810724A CN 102810724 A CN102810724 A CN 102810724A CN 2012101741562 A CN2012101741562 A CN 2012101741562A CN 201210174156 A CN201210174156 A CN 201210174156A CN 102810724 A CN102810724 A CN 102810724A
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- high frequency
- frequency antenna
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- electric conducting
- conducting material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/3657—Decoupling of multiple RF coils wherein the multiple RF coils do not have the same function in MR, e.g. decoupling of a transmission coil from a receive coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/42—Screening
- G01R33/422—Screening of the radio frequency field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/002—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using short elongated elements as dissipative material, e.g. metallic threads or flake-like particles
Abstract
A high-frequency antenna unit for a magnetic resonance apparatus (10) includes a high-frequency antenna (22) and a shield unit (24). The shield unit (24), the high-frequency antenna (22), or a combination thereof is formed at least partially from a composite material. The composite material includes at least one electrically conducting material and at least one electrically non-conducting material.
Description
Technical field
The present invention relates to a kind of high frequency antenna unit with high frequency antenna and screen unit, it is especially for magnetic resonance device.
Background technology
The gradient coil of magnetic resonance device flows through the electric current of the pulse of the gradient magnetic that is used to change during magnetic resonance measurement.Thereby the electric current of the electric current of this pulse or variation and the stationary magnetic field of magnetic resonance device interact and have produced vibration and the noise of not expecting in that the housing region that is used to hold the patient is inner.
Produce and the gradient magnetic that be alternation by gradient coil, inner and/or go out eddy current in the high-frequency conductors of the high frequency antenna of magnetic resonance device in the radioshielding device induced inside of magnetic resonance device.Thereby this eddy current that induces interacts with static magnetic field and causes in the inner vibration of not expecting of high frequency antenna, high-frequency conductors and radioshielding device, and this vibration produces additional noise again.In addition, this eddy current that induces can be in high frequency antenna and/or the inner warm that produces of radioshielding device.The heat that should in high frequency antenna and/or radioshielding device, be produced can cause in housing region and/or the inner temperature rise of not expecting of patient.Thereby for example can influence unfriendly for patient's comfortableness and/or owing to the increase of the power loss of thermal noise and/or high frequency antenna particularly reduces the efficient of magnetic resonance measurement.
Summary of the invention
The technical problem that the present invention will solve is, a kind of high frequency antenna unit that is used for magnetic resonance equipment is provided, and wherein reduces and/or prevented the induction of eddy current.
The present invention is from having the high frequency antenna unit of high frequency antenna and screen unit, and it is especially for magnetic resonance device.
The present invention's suggestion, screen unit and/or high frequency antenna are formed by the composite material with at least a electric conducting material and electrically non-conductive material at least in part.Advantageously, thus can utilize high frequency antenna and/or screen unit prevent alternation gradient fields and/or alternation gradient pulse induction and reduce at least and/or prevent induction at the inner eddy current of not expecting of high frequency antenna and/or screen unit.In addition, because in the reduction of high frequency antenna and/or screen unit internal vortex, can also reduce and/or prevent during forming images acoustic noise at least and/or heat produces and/or the formation of pseudo-shadow.
In this connection, should be especially screen unit be interpreted as and be configured to external shield (particularly gradient unit) high-frequency signal and/or be used for the unit of high frequency antenna with outside interference signal shielding.Preferably, construct screen unit like this, make the high-frequency signal of high frequency antenna on screen unit, be reflected.For this reason, screen unit is arranged along the radial direction between high frequency antenna and gradient unit.Preferably; Screen unit and/or high frequency antenna are constructed like this; Make the induction utilize the eddy current that high frequency antenna and/or screen unit produce through the interaction with gradient fields and/or gradient pulse; Because electrical characteristics, the particularly conductivity of composite material can be suppressed at high frequency unit and/or screen unit inside.In addition, should composite material be interpreted as the raw material that has comprised two or more interconnected materials and/or raw material especially, wherein its property of raw material can be configured to different with the material behavior of the single material of composite material and/or raw material.Particularly for the material behavior of composite material, the material property of single composition and/or material and/or geometric properties (for example particle size) are important.For example, fiber and/or particulate are embedded into composite material under the situation of fibrous composite, for example in another composition of the array of composite material.Electrically non-conductive material preferably includes insulator, and the latter can have pottery and/or epoxy resin and/or glass and/or mica and/or anodized copper and/or metal oxide and/or natural rubber and/or synthetic rubber and/or silicon at least in part.
In addition, the present invention suggestion, electric conducting material has and is at least 30 * 10
6Ω
-1m
-1The conductivity of value, can be implemented under the high frequency situations thus, the particularly favourable conduction of the composite material in the frequency range of the high-frequency signal of high frequency antenna.Electric conducting material has at least 30 * 10 under 20 ℃ temperature and direct current situation
6Ω
-1m
-1The value of conductivity.If in magnetic resonance device, adopt the high frequency antenna unit, then this electric conducting material preferably has at least 58.0 * 10 under the situation of 20 ℃ temperature and under dc condition
6Ω
-1m
-1The conductivity of value.For example; The frequency range of the high-frequency signal of high frequency antenna; In the magnetic resonance equipment of the magnetic field intensity of the about 1.5T with main field, be positioned at about 63MHz, and in the magnetic resonance equipment of the magnetic field intensity of the about 3.0T with main field, be positioned at about 123MHz.
In addition; The present invention's suggestion; Electric conducting material comprises the electric conducting material composition (Werkstoffelemente) that is arranged in composite inner at least in part disconnected from each otherly, and the electric capacity that can advantageously be created in thus between the single electric conducting material element of composite inner separates.The electric capacity of single electric conducting material composition separates the conductivity that depends on frequency that produces composite material, thereby preferably is implemented in the conductivity of the frequency signal in the frequency range in the megahertz scope and the electric non-conducting and/or the insulation of the frequency signal in the frequency range in kilohertz range.Preferably; The electric conducting material composition of layout disconnected from each other forms three-dimensional, particularly irregular framework and/or three-dimensional, irregular structure particularly at least in part, its be at least partly interrupt and its be embedded in by the included array of electrically non-conductive material inner.At this, the single electric conducting material composition of electric conducting material separates through electrically non-conductive material in composite inner.
For example, can form electric conducting material composition disconnected from each other by single particulate and/or single particle.Yet particularly advantageous is that electric conducting material comprises the electric conducting material composition that is formed by fiber and/or line at least in part.Thus, can be implemented in composite inner for the important network configuration of function of shielding advantageous particularly.Preferably, however fiber and/or line comprise the maximum length of length and the about 2000 μ m of about at least 1 μ m is preferably the maximum length of about 200 μ m.At this, the cross section of fiber and/or line can comprise the maximum of about 10 μ m, preferably approximately the maximum of 1.0 μ m and particularly preferably comprise the maximum of about 0.5 μ m.
Particularly preferably; Electric conducting material comprises the electric conducting material composition that is at least partly formed by CNT and/or graphite material (Graphen-Werkstoff); Thus, can have under the high frequency situations, particularly have the composite material of the electric conducting material composition of very little ohmic loss under the frequency situation in the megahertz scope for screen unit and/or high frequency antenna provide.At this, should CNT be interpreted as such electric conducting material especially, it is formed by the small cylinder structure of carbon, the particularly nanotube (carbon nanotubes=CNT) by molecule at least in part.
Suggestion in another structure of the present invention, high frequency antenna has the high frequency antenna off resonance unit of at least one conductor element that has comprised the antenna sheet intersegmental part that is arranged in high frequency antenna.In this connection, should high frequency antenna off resonance unit be interpreted as especially and can be used for the off-resonance frequency scope of the high frequency antenna in (nicht-aktiv) of passive (passiv) and/or non-active operational mode unit about the frequency range off resonance in operational mode initiatively.At this, the off-resonance frequency scope is constructed to different with frequency range in operational mode initiatively, and wherein, this frequency range can be formed by the transmit frequency range and/or the receive frequency range of high frequency antenna.At this, can high frequency antenna be configured to transmitter antenna and/or be configured to receiver antenna.High frequency antenna preferably includes a plurality of antenna fragments.Through can advantageously realizing the connection of nonlinear electric assembly, for example PIN diode for the off resonance of high frequency antenna according to structure of the present invention, method is, can off resonance electric current and high-frequency signal is overlapping by conductor element.Preferably, have the detuned circuit of conductor element, wherein this conductor element is arranged in composite inner for each non-linear electric assembly and/or one group of non-linear electric assembly setting.
If at least one conductor element has copper wire at least in part, then can realize the off resonance of high frequency antenna especially simple and efficiently.Because this at least one conductor element as the structure of copper wire, provides the good conductor of the off resonance that is suitable for high frequency antenna, it particularly provides missilgnment voltage to the high frequency antenna that is formed by the composite material that has with respect to the high resistance of off resonance at least in part.Carry out the off resonance of high frequency antenna by the feed-in of direct current, wherein composite material has the high resistance with respect to direct current.Yet, can suppress this high resistance by copper wire in advantageous particularly ground.Preferably, copper wire has 0.5mm at least
2Cross section, can advantageously prevent the overheated of copper wire thus, the current strength that particularly in copper wire, applies is during for hundreds of mA at least.In addition, because little cross section can also be suppressed at the induction of the inner eddy current of copper wire.
As at least one conductor element as the replacement of the structure of copper wire or additional, this at least one conductor element can also be at least in part with the arranged in form of thin conductor layer at the antenna sheet intersegmental part.Preferably, the cross-sectional area of thin conductor layer is 0.5mm at least
2Thereby, can prevent the overheated of thin conductor layer and/or the damage of not expecting equally at this, under the situation of the current strength of the hundreds of at least mA that particularly in the thin conductor layer, apply.In addition, because the little cross section of thin conductor layer can be suppressed at the induction of the inner eddy current of conductor layer.Particularly preferably, the thin conductor layer can be at least in part by metal dust and/or sheet metal and/or ag material and/or comprise the material and/or the tin indium oxide of graphite and/or mix fluorine tin oxide and/or doping tin oxide and/or form by organic conductor layer and/or graphite material (Graphen-Werkstoff) that CNT constitutes.At this, can conductor layer that should be thin be arranged in composite inner with embedding.
In addition, the present invention also has the magnet unit that comprised high frequency antenna unit, main magnet and gradient unit and a magnetic resonance device of analytic unit from a kind of.
In addition, the present invention is also from a kind of method that is used to make the high frequency antenna unit, and wherein, screen unit and/or high frequency antenna are by the composite material manufacturing with at least a electric conducting material and electrically non-conductive material.
The present invention's suggestion sprays to composite material on the carrier element.Preferably, this carrier element has carrier material, and this carrier material is formed by the material of electric insulation, so that prevent the infringement of not expecting to screen unit and/or high frequency antenna.Carrier element for example can be formed by the inboard of the cylindrical gradient coil of in epoxy resin, pouring into a mould.Through according to structure of the present invention, can advantageously realize making especially cheaply and fast of screen unit and/or high frequency antenna.
In addition, the present invention's suggestion sprays to composite material on the carrier element to dissolving in the state of aggregation of liquid and/or in solvent.Can thin especially composite layer be sprayed on the carrier element with even thick bed thickness.For example, can the form of composite material according to the composite material ink be sprayed on the carrier element through jet ink process.The bed thickness of composite material preferably depends on the material of composite material.Yet especially; Construct the minimum bed thickness of composite material like this; Make that minimum bed thickness is electromagnetic about 1-2 the incident degree of depth, wherein after the incident degree of depth in composite material, electromagnetic amplitude is also corresponding to the 1/e of the electromagnetic amplitude that hits screen unit.
Spray on the carrier element if will have the composite material of 40% (percent by volume) and preferred maximum 30% (percent by volume) to the maximum ratio electric conducting material of 40% (percent by volume), then can realize particularly advantageous reduction the eddy current of not expecting in high frequency antenna inside.
Particularly preferably; Spraying has the composite material of the electric conducting material that has comprised graphite material and/or CNT; Can provide for screen unit and/or high frequency antenna thus to have under high frequency situations, particularly have the composite material of the electric conducting material of very little ohmic loss under the frequency situation in the megahertz scope.Preferably, have the electric conducting material that has comprised graphite material and/or CNT composite material the layer minimum thickness be at least 2 μ m.
In a kind of preferred development of the present invention, advise, at least one conductor element of high frequency antenna off resonance unit is positioned on the carrier element, and then composite material is sprayed on the carrier element.Can make high frequency antenna unit, particularly high frequency antenna especially simply with high frequency antenna off resonance unit.
Alternatively, the present invention is from a kind of method that is used to make the high frequency antenna unit, and wherein, screen unit and/or high frequency antenna are by the composite material manufacturing with at least a electric conducting material and at least a electrically non-conductive material.
The present invention suggestion is made screen unit and/or high frequency antenna by composite material through injection molding process, can realize the simple especially and low manufacturing of cost of screen unit and/or high frequency antenna thus.
Description of drawings
Other advantages of the present invention, characteristic and details are from below in conjunction with drawing the description of accompanying drawing to embodiment.In the accompanying drawing,
Fig. 1 has illustrated according to magnetic resonance device of the present invention with sketch map,
Fig. 2 shows the magnet unit that has according to high frequency antenna of the present invention unit,
Fig. 3 show high frequency antenna unit with high frequency antenna off resonance unit and
Fig. 4 shows according to manufacturing approach of the present invention.
Embodiment
Fig. 1 shows according to magnetic resonance device 10 of the present invention.Magnetic resonance device 10 comprises having and is used to produce strong and the magnet unit 11 (Fig. 1 and 2) of constant main field 13 particularly.The main magnet 12 of magnet unit 11 comprises superconduction magnet exciting coil 40 for this reason.In addition, magnetic resonance device 10 also has the cylindrical housing region 14 that is used to hold patient 15, and wherein housing region 14 is surrounded by magnet unit 11 in a circumferential direction.Patient 15 can be moved in the housing region by patient's bed 16 of magnetic resonance device 10.Patient's bed 16 is movably disposed within magnetic resonance device 10 inside for this reason.
In order to control main magnet 12, gradient control unit 18 and in order to control high frequency antenna control unit 23, magnetic resonance device 10 has by the formed control unit 25 of computing unit.Control unit 25 middle grounds control magnetic resonance device 10 is for example implemented predetermined imaging gradin-echo.In addition, control unit 25 comprises the analytic unit that is used for analysis of image data.Control information (such as imaging parameters) and the MRI of rebuilding can for example be shown to the operator of magnetic resonance device 10 at least one monitor on the display unit 26 of magnetic resonance device 10.In addition, magnetic resonance device 10 also has input unit 27, can be by operator input information and/or parameter during measuring process by this input unit.Input unit 27 for example can comprise keyboard and/or computer mouse and/or other input elements.
Shown magnetic resonance device 10 can also comprise other assemblies that magnetic resonance device 10 has usually certainly.The general operation principle of magnetic resonance device 10 is known for the professional, thereby general assembly is not described in detail.
For the conduction of the useful signal of high-frequency signal with in effective inhibition of the eddy current of in thousands of hertz frequency range, responding to, screen unit 24 is formed by the composite material of first material with conduction and nonconducting second material with high frequency antenna 22 at least in part.In the structure of a kind of replacement of the present invention, composite material can also have other electric conducting materials and/or electrically non-conductive material.
Electrically non-conductive material is for example formed by pottery.In addition, electrically non-conductive material has little dielectric loss tan (δ) under high frequency, the particularly frequency at the high-frequency signal of high frequency antenna, and wherein, loss angle δ arc tangent has defined the active power of electrically non-conductive material and the ratio of reactive power.Alternatively or additionally, electrically non-conductive material can also think that significant material forms by epoxy resin and/or glass and/or mica and/or anodised copper and/or metal oxide and/or natural rubber and/or synthetic rubber and/or silicon and/or other professionals.Electrically non-conductive material forms non-conductive array in composite inner, and it is inner that wherein the electric conducting material composition of electric conducting material embeds and/or be arranged in non-conductive array.
Electric conducting material has following conductivity: this conductivity has at least 58.0 * 10 under about 20 ℃ temperature and direct current situation
6Ω
-1m
-1Value so that make the conduction that has a signal of the frequency in the megahertz scope in high frequency antenna 22 and screen unit 24 inside, particularly composite inner become possibility.In the application of the replacement that is used for magnetic resonance device 10 of high frequency antenna unit 21, electric conducting material can also have at 20 ℃ with under the direct current situation 30 * 10 at least
6Ω
-1m
-1Conductivity.
In addition, electric conducting material is formed by single electric conducting material composition, and the latter is arranged by part at least in that the non-conductive array that is formed by electrically non-conductive material is inner disconnected from each otherly.The electric conducting material composition of electric conducting material is preferably formed by line and/or fiber.Preferably; The electric conducting material composition of electric conducting material is formed by CNT (CNT) and/or graphite material, thereby presents the favourable conduction that has the signal of the frequency in the megahertz scope for the particularly advantageous conductivity of the little ohmic loss of having of electric conducting material and/or in high frequency antenna 22 and screen unit 24 inside.Fiber that constitutes by CNT and/or by graphite material and/or line have the maximum cross section of about 10 μ m, preferably approximately maximum cross section and the special maximum cross section value of 0.5 μ m preferably approximately of 1.0 μ m.The fiber that constitutes by CNT and/or by graphite material and/or the length of line are between 1 μ m and the maximum about 2000 μ m, yet preferably between 1 μ m and maximum 200 μ m.
The electric conducting material composition of electric conducting material is arranged to three-dimensional irregular framework and/or three-dimensional irregular structure at composite material or by the array inside that electrically non-conductive material forms, thereby the electric conducting material composition is in inner netted framework and/or the netted structure of forming of non-conductive array.Yet three-dimensional irregular framework and/or three-dimensional irregular structure interrupt, and make single electric conducting material composition spatially be arranged in three-dimensional irregular framework and/or three-dimensional irregular structure inside at least in part disconnected from each otherly.But the layout of single electric conducting material composition is irregular, thereby the interval between single electric conducting material composition also is irregular.Intermediate space between single electric conducting material composition is filled up by electrically non-conductive material.
Because the apart between single electric conducting material composition forms electric capacity and separates between single electric conducting material composition.At this; Be chosen in the interval between the single electric conducting material composition like this, make and to carry out the frequency signal conduction and for being prevented from the frequency signal conduction of composite inner at the frequency signal of hertz scope up to kilohertz range for the frequency signal in the megahertz scope.At this, length and/or the cross-sectional area and/or the concentration of the electric conducting material composition of composite inner is depended at the interval between single electric conducting material composition.The concentration of the electric conducting material composition of composite inner is maximum 40% (percent by volume) but is preferably maximum 30% (percent by volume) to 40% (percent by volume).
For the frequency signal in low-frequency range; The frequency signal in hertz scope to kilohertz range particularly; Composite material has low conductivity owing to the three-dimensional irregular framework that interrupts and/or the three-dimensional irregular structure of interruption, thereby reduces and/or stoped through gradient fields with preferred frequency in kilohertz range and/or the current vortex that gradient pulse induces.Preferably, the conductivity of composite material has the conductivity value of insulator in this frequency range.On the contrary; Under the frequency signal situation of high frequency antenna; Particularly under the situation of the frequency signal in the megahertz scope, composite material has high conductivity, thereby in the frequency range of number megahertz, carries out the conduction of the high-frequency signal of high frequency antenna 22 and screen unit 24 like this.The combination of structure composite material like this makes ratio resistance (spezifischer Widerstand) minimum in the megahertz scope, but in hertz scope and kilohertz range, gets the value of maximum.
In addition, high frequency antenna unit 21 comprises high frequency antenna off resonance unit 33, and it is configured in the passive operational mode of high frequency antenna 22 and/or in the off resonance (Fig. 3) of inoperative (Nichtbetrieb) medium-high frequency antenna 22.High frequency antenna off resonance unit 33 has a plurality of conductor elements 34, and it is arranged in the antenna fragment 35, wherein the exemplary antenna fragment 35 with conductor element 34 that shows in Fig. 3.Conductor element 34 is formed by thin copper wire.The cross-sectional area of thin copper wire is 0.5mm at least
2Thereby, in the heating of the inhibition thin copper wire in service of high frequency antenna off resonance unit 33 and therefore prevent the damage of thin copper wire.Direct current at hundreds of at least mA in service of high frequency antenna off resonance unit 33 flows through conductor element 34.
Copper wire is arranged in antenna fragment 35 inside (Fig. 3) by composite material with surrounding.Copper wire links to each other and links to each other with bias voltage source 38 through coil 41 at second end with PIN diode 37 conductions at first end in detuned circuit 36 inside of high frequency antenna off resonance unit 33.
In the passive operational mode of high frequency antenna 22 and/or between the inoperative period; On the antenna fragment, apply the off resonance electric current by high frequency antenna off resonance unit 33, thereby distinguish mutually with the running frequency of in the operational mode of antenna element 22, for example sending operational mode and/or receiving operational mode medium-high frequency antenna 22 in the current frequency of the passive operational mode of high frequency antenna 22 and/or inoperative.
As the replacement as the structure of copper wire of the conductor element 34 of high frequency antenna off resonance unit 33, the conductor layer that conductor element 34 can also be configured to approach, wherein thin conductor layer are preferably formed by the material that has such as the similar good conductivity of the conductivity of copper.At this, thin conductor layer can and/or comprise the material and/or the tin indium oxide of graphite and/or mix tin oxide and/or the doped stannum oxide of fluorine and/or the organic conductor layer that is made up of CNT and/or graphite material and/or professional think that significant other materials forms by metal dust and/or sheet metal and/or ag material.At this, the cross-sectional area of thin conductor layer should be 0.5mm at least
2Thereby, the damage of the conductor layer that the heating of the conductor layer that the operation of the unit of high frequency antenna off resonance here 33 can prevent to approach equally and preventing thus approaches.
For above-described manufacturing, the method that is used to make high frequency antenna unit 21 has been described in Fig. 4 with high frequency antenna elements 21 of screen unit 24.In the method, in spraying process 101, composite material is sprayed on the carrier element 29,32 by the spray equipment that is not shown specifically with high frequency antenna 22 in order to make screen unit 21.At this, composite material is sprayed to being positioned on the radial direction 20 on the inner side of cylindrical vector unit 29 of gradient coil 17 in spraying process 101.In addition, composite material is sprayed to being positioned on the radial direction 20 on the outside side of cylindrical vector unit 32 of high frequency antenna 22 in spraying process 101.
Before spraying process 101, with composite material be transformed into the state of aggregation (Aggregatzustand) of liquid and/or in solvent dissolving spray on the carrier element 29,32 by spray equipment in spraying process with the form of hydrojet then.Hydrojet for example can be the liquid with black shape of composite material liquid and/or dissolving, and its ink bundle by spraying is sprayed onto on the carrier element 29,32.It is also conceivable that other structures of hydrojet.
Composite material has the maximum ratio electric conducting material and preferred maximum 30% to 40% (percent by volume) of about 40% (percent by volume) in liquid aggregate state and/or at dissolved state, and wherein electric conducting material preferably includes CNT and/or graphite material.Through the composite material of the state that is sprayed on liquid aggregate state and/or in solvent, dissolves, realized at high frequency antenna 22 and the even thick bed thickness of screen unit 24 inside for composite material.
For in high frequency antenna 22 inner integrated high frequency antenna off resonance unit 33, in positioning process 100, be positioned at the conductor element 34 of high frequency antenna off resonance unit 33 on the cylindrical vector unit 32 in advance and spray then according to liquid aggregate state and/or at the composite material of dissolved state.After spraying process 101, the layer of the spraying of dry composite material in drying process 102.At this, the bed thickness of the composite material on cylindrical vector unit 29 all is at least 2 μ m for high frequency antenna 22 and for screen unit 24, but preferably until hundreds of μ m.Yet the bed thickness of composite material is constructed thickly more, and screen unit 24 is constructed firmly more and stable with high frequency antenna 22, thereby bed thickness can be for until several millimeters.
As the replacement of the spraying of composite material to the carrier element of carrier element, can also make screen unit 24 and high frequency antenna 22 according to injection molding forming method.
Claims (17)
1. high frequency antenna unit with high frequency antenna (22) and screen unit (24); Especially for magnetic resonance device (10); It is characterized in that said screen unit (24) and/or said high frequency antenna (22) are formed by the composite material with at least a electric conducting material and at least a electrically non-conductive material at least in part.
2. high frequency antenna according to claim 1 unit is characterized in that, said electric conducting material has following conductivity: this conductivity has at least 30 * 10
6Ω
-1m
-1Value.
3. high frequency antenna according to claim 1 and 2 unit is characterized in that, said electric conducting material comprises the electric conducting material composition that is arranged in composite inner at least in part disconnected from each otherly.
4. according to each described high frequency antenna unit in the claim 1 to 3, it is characterized in that said electric conducting material comprises the electric conducting material composition that is formed by fiber and/or line at least in part.
5. according to each described high frequency antenna unit in the claim 1 to 4, it is characterized in that said electric conducting material comprises the electric conducting material composition that is at least partly formed by CNT.
6. require each described high frequency antenna unit in 1 to 5 according to aforesaid right, it is characterized in that, said electric conducting material comprises the electric conducting material composition that is at least partly formed by graphite material.
7. require each described high frequency antenna unit in 1 to 6 according to aforesaid right; It is characterized in that said high frequency antenna (22) has the high frequency antenna off resonance unit (33) that has comprised at least one conductor element (34) that is arranged in antenna fragment (35) inside.
8. high frequency antenna according to claim 7 unit is characterized in that, said at least one conductor element (34) has copper wire at least in part.
9. high frequency antenna according to claim 7 unit is characterized in that, at least one conductor element (34) is disposed in antenna fragment (35) inside with the form of thin conductor layer at least in part.
10. high frequency antenna according to claim 9 unit; It is characterized in that said thin conductor layer is at least in part by metal dust and/or sheet metal and/or ag material and/or comprise the material and/or the tin indium oxide of graphite and/or mix tin oxide and/or the doped stannum oxide of fluorine and/or formed by organic conductor layer and/or graphite material that CNT constitutes.
11. the magnetic resonance device with magnet unit (11) and analytic unit, this magnet unit have comprised according to the described high frequency antenna of claim 1 unit (21), main magnet (12) and gradient unit (17).
12. one kind is used for making the method according to the described high frequency antenna of claim 1 unit (21); Wherein, Screen unit (24) and/or high frequency antenna (22) are by the composite material manufacturing with at least one electric conducting material and at least a electrically non-conductive material; It is characterized in that, composite material is sprayed to carrier element (29,32).
13. method according to claim 12 is characterized in that, composite material is sprayed on the said carrier element (29,32) to dissolving in the state of aggregation of liquid and/or in solvent.
14. method according to claim 12 is characterized in that, spraying has the composite material of the maximum ratio electric conducting material of 40% (percent by volume).
15. method according to claim 12 is characterized in that, spraying has the composite material of the electric conducting material that has comprised graphite material and/or CNT.
16. method according to claim 12; It is characterized in that; At least one conductor element (34) of high frequency antenna off resonance unit (33) is positioned at said carrier element (29,32) to be gone up and then composite material is sprayed on this carrier element (29,32).
17. one kind is used for making the method according to the described high frequency antenna of claim 1 unit (21); Wherein screen unit (24) and/or high frequency antenna (22) are by the composite material manufacturing with at least a electric conducting material and at least a electrically non-conductive material; It is characterized in that said screen unit (24) and/or high frequency antenna (22) pass through the injection molding process manufacturing by composite material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011076717.7 | 2011-05-30 | ||
| DE102011076717A DE102011076717A1 (en) | 2011-05-30 | 2011-05-30 | High-frequency antenna unit, a magnetic resonance apparatus having a high-frequency antenna unit, and a manufacturing method for a high-frequency antenna unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102810724A true CN102810724A (en) | 2012-12-05 |
Family
ID=47173146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101741562A Pending CN102810724A (en) | 2011-05-30 | 2012-05-30 | High-frequency antenna, magnetic resonace apparatus equipped with the antenna, and manufacturing method for the antenna |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20120306496A1 (en) |
| CN (1) | CN102810724A (en) |
| DE (1) | DE102011076717A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8970217B1 (en) | 2010-04-14 | 2015-03-03 | Hypres, Inc. | System and method for noise reduction in magnetic resonance imaging |
| EP2708908A1 (en) * | 2012-09-13 | 2014-03-19 | Skope Magnetic Resonance Technologies GmbH | Isolating MR magnetic field probes from external RF irradiation |
| GB2533598A (en) * | 2014-12-22 | 2016-06-29 | Voyagerblue Ltd | Shielding device |
| US11292166B2 (en) | 2017-04-07 | 2022-04-05 | Tactotek Oy | Method for manufacturing an electronic assembly and an electronic assembly |
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| CN1199496A (en) * | 1996-08-30 | 1998-11-18 | 株式会社东金 | Composite magnetic tape |
| CN1291338A (en) * | 1998-01-23 | 2001-04-11 | 佩拉泰克有限公司 | Polymer composition |
| CN1615495A (en) * | 2002-01-11 | 2005-05-11 | Sca封装销售有限公司 | Radio frequency resonant tags with conducting patterns connected via a dielectric film |
| US20050113676A1 (en) * | 2003-04-02 | 2005-05-26 | Biophan Technologies, Inc. | Device and method for preventing magnetic-resonance imaging induced damage |
| KR20070035832A (en) * | 2005-09-28 | 2007-04-02 | 엘지전자 주식회사 | Interception material of electromagnetic waves |
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| US5406204A (en) * | 1992-03-27 | 1995-04-11 | Picker International, Inc. | Integrated MRI gradient coil and RF screen |
| US5321358A (en) * | 1993-03-01 | 1994-06-14 | General Electric Company | Embedded NMR sensors for cure monitoring and control of composite structures |
| US5572129A (en) * | 1995-01-19 | 1996-11-05 | The Regents Of The University Of California | RF shield for gradient coil |
| AR008989A1 (en) * | 1995-12-05 | 2000-03-08 | Lwt Instr Inc | STRUCTURES OF COMPOSITE MATERIAL WITH LESS ATTENUATION OF SIGNAL, METHOD FOR FORMING THEM; SUBSTITUTE UNION PIPES AND DRILL TRAIN COMPONENT WITH SUCH MATERIAL |
| US6954068B1 (en) * | 2000-01-21 | 2005-10-11 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus |
| US6567685B2 (en) * | 2000-01-21 | 2003-05-20 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus |
| DE10056807A1 (en) * | 2000-11-16 | 2002-05-23 | Philips Corp Intellectual Pty | HF planar resonator for transmitting/receiving circularly polarized electromagnetic waves has conductor structures stretching from a central area in radial directions and a conductor loop around this area for a return current. |
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| US7015692B2 (en) * | 2003-08-07 | 2006-03-21 | Ge Electric Company | Apparatus for active cooling of an MRI patient bore in cylindrical MRI systems |
| US7679364B2 (en) * | 2005-10-18 | 2010-03-16 | Tursiop Technologies Llc | Method and apparatus for high-gain magnetic resonance imaging |
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| JP6017416B2 (en) * | 2010-05-10 | 2016-11-02 | コリア インスティチュ−ト オブ マシナリ− アンド マテリアルズ | Broadband electromagnetic wave absorber and manufacturing method thereof |
| US8797030B2 (en) * | 2011-07-28 | 2014-08-05 | General Electric Company | Magnetic resonance radio-frequency coil and method of manufacturing |
| US8779773B2 (en) * | 2011-08-17 | 2014-07-15 | General Electric Company | Thermoacoustic RF body coil liner for reduced acoustic noise in an MR system |
-
2011
- 2011-05-30 DE DE102011076717A patent/DE102011076717A1/en not_active Withdrawn
-
2012
- 2012-05-29 US US13/482,817 patent/US20120306496A1/en not_active Abandoned
- 2012-05-30 CN CN2012101741562A patent/CN102810724A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199496A (en) * | 1996-08-30 | 1998-11-18 | 株式会社东金 | Composite magnetic tape |
| CN1291338A (en) * | 1998-01-23 | 2001-04-11 | 佩拉泰克有限公司 | Polymer composition |
| CN1615495A (en) * | 2002-01-11 | 2005-05-11 | Sca封装销售有限公司 | Radio frequency resonant tags with conducting patterns connected via a dielectric film |
| US20050113676A1 (en) * | 2003-04-02 | 2005-05-26 | Biophan Technologies, Inc. | Device and method for preventing magnetic-resonance imaging induced damage |
| KR20070035832A (en) * | 2005-09-28 | 2007-04-02 | 엘지전자 주식회사 | Interception material of electromagnetic waves |
Also Published As
| Publication number | Publication date |
|---|---|
| US20120306496A1 (en) | 2012-12-06 |
| DE102011076717A1 (en) | 2012-12-06 |
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Application publication date: 20121205 |